FT-891 Audio Hiss?

Have any other 891 owners noticed a lot of audio hiss when using headphones? Very noticeable to me even with band noise. Not very noticeable with the speaker and would not be an issue if mobile. I've tried various headphones with different impedance.
For a modern rig it seems excessive to me. The 857 is almost perfectly quiet by comparison.
Wondering if it is common to all or I have a bad unit.
Yes, I understand the DSP settings.
Thanks/73,
Steve
W1SRD

If there is noise w/ the AF gain at zero, add an attenuator between the PA and headphones. In fact, because headphones require a lot less power than a speaker and to keep things simple, it's common to see series resistance feeding the headphone jack:
In my old Kenwood TS120s, R4 & R5 not only split the monaural output to be compatible w/ stereo headphones, they also attenuate the signal. Yours is similar. In fact, the schematic in the FT891 service manual (page 81) shows R4701 & R4702 = 100Ω. If the level is too hot (and noisy) and you have plenty of overhead, just increase the value.

Since you need to reduce the level, it's simplest to just add TWO resistors inline with the headphones. A male-female adapter or short cord w/ two resistors inside does the job (you don't have to modify the rig). My PC-rig audio interface uses short cables that have resistors inside the connector shells.